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United States Patent | 5,338,629 |
Hibbard ,   et al. | August 16, 1994 |
A method is disclosed for manufacturing photostencils used in screening the faceplates of color cathode ray tubes. The photostencils are produced as progeny from a parent stencil photo plotted according to the dictates of a proximity photoprinting process in conjunction with the electron optical characteristics of the operational CRT. A rectangular beam is used for radiating light through the pattern of features on the parent stencil onto the photoresist of the progeny stencil. As a result, the features of the progeny stencil differ in size or shape or both, from those of the parent stencil.
Inventors: | Hibbard; Robert A. (Elburn, IL); Remec; Thomas M. (Des Plaines, IL) |
Assignee: | Zenith Electronics Corporation (Glenview, IL) |
Appl. No.: | 906615 |
Filed: | June 30, 1992 |
Current U.S. Class: | 430/23; 430/5; 430/24; 430/25; 445/52; 445/66 |
Intern'l Class: | G03C 005/00 |
Field of Search: | 430/23,24,25,5,321 445/66,52 |
3973964 | Aug., 1976 | Lange | 96/36. |
4248947 | Feb., 1981 | Oikawa | 430/5. |
4475797 | Oct., 1984 | Park | 354/1. |
5158491 | Oct., 1992 | Fendley et al. | 430/24. |